The principle design and case analysis of high-frequency switching power supply "is a professional book that systematically introduces high-frequency switching power supply technology. At the same time, this topic also covers three aspects: core principles, design methods, and practical engineering cases. The following is a detailed analysis:

1、 Core working principle

High frequency switching power supply (SMR), also known as switch mode rectifier, is a power regulation device that converts electrical energy through high-frequency switching devices such as MOSFET or IGBT. The switching frequency is usually controlled within the range of 50-100kHz, and the core principle is to maintain the stability of the output voltage by adjusting the time ratio (duty cycle) of the switching tube on and off. The main workflow is as follows:

AC input → EMI filtering (suppressing electromagnetic interference) → rectification filtering (AC to DC) → high-frequency inverter (DC to high-frequency AC) → high-frequency transformer (voltage conversion and isolation) → output rectification filtering (AC to DC) → stable DC output

It significantly reduces the volume and weight of transformers and filtering components through high-frequency design, with an energy conversion efficiency of over 90% and a volume of only 20% -30% of traditional linear power sources. It has significant advantages in efficiency and miniaturization.

2、 Core design points and examples

Example of Power Factor Correction (APFC) Circuit Design

Taking the high-power CCM mode APFC circuit with an output of 600W and a DC voltage of 400V as an example, the core parameters are calculated as follows:

The magnetic core can choose a ring-shaped magnetic powder core, which balances low electromagnetic interference and good electromagnetic compatibility characteristics. The wire diameter is calculated based on the effective value of the input current at a current density of 5A/square millimeter, resulting in a wire diameter of approximately 1.4mm.

2. Key design points related to switching frequency

The switching loss is proportional to the switching frequency, and the higher the frequency, the greater the switching loss; At the same time, high-frequency square waves can exacerbate harmonic distortion, leading to a decrease in EMI (electromagnetic interference) performance. The optimization plan includes:

Using frequency jitter technology to disperse noise energy and reduce EMI peak

Reasonably adjust the switching frequency in light load scenarios, taking into account dynamic characteristics and light load efficiency

Adopting resonant soft switching technology to reduce switching losses

3、 Book Content Reference

The book "High Frequency Switching Power Supply: Principles, Design, and Case Analysis" systematically covers the design of switching power supplies with various topological structures

Complete content including basic introduction to switching power supplies, non isolated/flyback/forward switching power supplies, switching power supplies with power factor correction, etc

We conducted in-depth analysis on the structure and working principle of each circuit, and provided calculation methods for key component parameters, debugging and testing processes. We also provided complete circuit schematics, component parameters, and printed circuit board diagrams

Suitable as a reference for engineering and technical personnel in the switching power supply industry, and can also be used as textbooks for related majors such as power electronics technology and electrical automation in higher education institutions

You can click on the link to read the book chapter: High frequency Switching Power Supply: Principles, Design, and Case Analysis - Tencent Reading

Do you need me to explain in detail the specific design steps of a certain topology structure for you? Can help you quickly implement engineering development

Shandong Wenbo Power Technology Co., Ltd. is located in Linyi City, Shandong Province. The company is engaged in the production of various specifications of rectifier equipment such as electroplating machines, electroplating equipment, high-frequency pulse electroplating power supplies, thyristor electroplating, electrolysis, aluminum oxidation, coloring, electrophoresis, electric brush plating, AC iron plating, periodic steering power supplies, as well as electroplating supporting equipment such as rollers, plating tanks, string buckets, filters, and spin dryers.

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